Ventilator



Feb. 9, 1943. R, WALKER 2,310,331

'VENTILATOR Fil ed Feb. 10. 1941 Patented Feb. 9, 1943 UNlTE sres OFFKIE5 Claims.

My invention relates to improvements in ventilators of a type providedwith a rotary hood or cowl for use on a chimney top or in connectionwith a room for ventilation.

One object of my invention is the provision of a novel ventilator of thekind described, which is simple in structure, cheap to make, strong,durable, not likely to get out of order, 'easily and quickly installedby an unskilled person, and which is efiicient in its operation.

Another object of the invention is the provision of a novel rotary hoodhaving novel means by which the draft is greatly improved.

A further object of the invention is the provision of novel means forpivotally supporting the hood, which is simple, easily installed, andwhich reduces the resistance to rotation of the hood to a minimum.

The novel features of my invention are hereinafter fully described andclaimed.

In the accompanying drawing, which illustrates my invention:

Fig. 1 is a side elevation of my improved ventilator.

Fig. 2 is a vertical side view of the ventilator shown in Fig. 1, thevane being omitted, and some parts shown in elevation and others invertical section.

Fig. 3 is a front elevation of the ventilator.

Fig. 4 is a bottom view of the form of the ventilator in which the lowerend of the hood has no bottom, but is wholly open.

Fig. 5 is an enlarged section on the line 5--5 of Fig. 2.

Fig. 6 is an enlarged section on the line 6-6 of Fig. 2.

Fig. '7 is a reduced bottom view of' a modification in which the squarelower end of the hood has a bottom with a circular opening in which isdisposed the tubular circular base member.

Similar characters of reference designate similar parts in the differentviews.

I designates the two opposite sides, and 2 the upper side of the hood,which in its lower side has an opening 3 into which the upper end of asupport comprising a vertical tubular member 4 extends.

The hood has within it a Venturi member comprising a transverse plate 5having a convex upper side and a concave lower side for a portion of itslength. The Venturi member 5 extends to and between the sides I of thehood, and upwardly and rearwardly from the front end of the hood aboveand spaced from the tubular member 4, as shown in Fig. 2. The Venturiplate 5 provides respectively above and below it two passages whichmerge together at their rear ends and which respectively communicatewith'the front end of the hood and with the interior of the tubularsupporting member 4.

Upon the upper side 2 of the hood at its rear end is a usual vane 6,disposed vertically in the median line of the top of the hood, and whichnormally swings the hood with its front end directed to the windward.

Each side I of the hood has between the upper side 2 of the hood and theVenturi member 5. means for admitting outside air and guiding itrearwardly through the hood. Such means, as shown, comprises verticalslots or passages 1, from the forward edges of which extend respectiveiyinwardly and rearwardly guiding lo-uvers 8'. The outside air enteringthe hood through the slots or passages l is guided rearwardly, and addsits force to the air entering the hood through the front end thereof,thus providing an increased draft upwardly through the tubular member 4,and the air passage under the Venturi member 5.

For rotatably supporting the hood, the following described mechanism isprovided.

9 designates a three arm bracket which has the ends of its armsfastenedto the inner wall of the tubular member 4. p

A vertical rod Ill has a lower end portion H of reduced diameterthreaded and extended through a vertical central hole in the bracket 9,and through the bottom of an oil cup l2 on the upper side of the bracket9. Figs. 2 and 6.

A nut I3 on the rod portion H in the cup 12. clamps the cup to thebracket 9. and a nut M on the port on H bears against the under side ofthe bracket 9, whereby the rod it! is held rigidly fastened to hebracket 9.

Encircling the rod H3 and revoluble around the rod is a vertical tubeIt, which extends upwardly through a transverse bar It. the ends ofwhich are attached to the inner sides of the sides l of the hood. Thetube I5 also extends through a hole provided in the Venturi member 5.The upper end portion of the tube It is exteriorly threaded. saidportion being extended through a hole provided in the upper side 2 ofthe hood.

Bearing against the upper and lower sides respectively of the upper side2 of the hood are two collars IT and IS. A nut I9 on the threaded upperend of the tube !5 clamps the upper collar H against the top 2 of thehood, and a nut 20 on the threaded part of the tube It clamps the lowercollar l8 against the under side of the top 2 of the hood.

In the upper end of the rod I is mounted a fiber pad 2| on the upper endof which rests a ball 22, which supports a pad 23 also of fiber, mountedin the nut l 9, whereby the tube [5 and the hood are rotatably supportedon the rod I0.

When the wind veers, the vane 6 swings the hood I and the tube l5 aroundon the rod l0 until the front end of the hood faces windward, at whichtime the wind entering the hood through its front end, and through theside slots or passages 1, passes out of the rear end of the hood. Thelouvers 8 guide the air entering through the slots or passages Irearwardly, thus adding force to the air current, whereby a strongupward draft is created through the supporting tubular base member 4 andthrough the passage in the hood under the Venturi member 5.

The modified form of the ventilator, shown in Fig. '7, corresponds instructure to the form shown in Fig. 2, excepting that in the form, shownin Fig. 'l, the square lower end of the hood I is provided with a bottom3 having a circular opening 3 through which extends the tubular basemember 4. In some locations and conditions of wind currents, thepresence of the bottom 3', effects an increased upward draft through thebase member 4.

Other modifications of my invention, within the scope of the appendedclaims, may be made without departing from the spirit of my invention.

What I claim is:

1. In a ventilator of the kind described, a vertical tubular support, ahood open at its front and rear ends and having an opening in its lowerside into which said support extends, and having within it a transverseVenturi member spaced from and extending upwardly and rearwardly oversaid support, and providing respectively above and below said member twopassages merging together at their rear ends and respectivelycommunicating with said tubular support and the front end of said hood,the sides of said hood between the upper side thereof and said Venturimember having each louver covered air intake passages, and means forrevolubly supporting said hood on a vertical axis on said support, saidhood having a vane disposed to normally swing said hood with its frontend directed to the windward.

2. In a ventilator of the kind described, a Vertical tubular supportingmember, a hood open at its front and rear ends, and having in its lowerside an opening into which extends said tubular member, and meansrevolubly supporting said hood on a vertical axis on said support, saidhood having a vane disposed to normally swing said hood with its frontend directed to the windward, said hood having within it a transverseVenturi member spaced from and extending upwardly and rearwardly oversaid tubular member, and providing two passages merging together attheir rear ends and respectively communicating with said tubular memberand the front end of said hood, said hood having in each side betweenthe upper side thereof and said Venturi member means for admitting airfrom the outside into said hood, said hood having means for guiding theair so admitted rearwardly.

3. In a ventilator of the kind described, a vertical support, a verticalrod, means rigidly supporting said rod at its lower end axially on saidsupport, a tube encircling and axially revoluble on said rod and havingan exteriorly threaded upper end, a hood open at its front and rear endsand having in its lower side an opening into which said support extends,and having within it a Venturi member extending upwardly and rearwardlyabove and spaced from said supporting member and transversely acrosssaid hood, the threaded upper end of said tube extending through theupper side of said hood, two nuts on said threaded portion of said tuberespectively above and below the upper side of said hood, means held bysaid nuts clamped to the upper and lower sides of the top of said hoodsupporting said hood, and means on the upper end of said rod revolublysupporting said upper nut, and thereby said hood and said tube, saidhood having a vane disposed to normally swing said hood with its frontend directed to the windward.

4. In a ventilator of the kind described, a hood open at its front andrear ends, and having a draft opening in its lower side, and havingwithin it a transverse Venturi member inclining upwardly and rearwardlyover said opening and providing two passages merging at their rear endsand respectively communicating with said front end and said opening,each side of said hood having between said Venturi member and the upperside of said hood means for admitting outside air, said sides of saidhood having means for guiding rearwardly the air so admitted, and meanspivotally supporting said hood on a vertical axis.

5. In a ventilator of the kind described, a vertical tubular supportingmember, a hood open at its front and rear ends and having in its lowerside an opening into which discharges said tubular member, a verticalrod, means rigidly supporting said rod axially on said supportingmember, a vertical tube encircling and revoluble around said rod andhaving an exteriorly threaded upper end portion extending through theupper side of said hood, two nuts mounted on said threaded portionrespectively above and below said upper side, means between said nutshaving clamping holding engagement with said upper side of said hood,and a ball supported upon the upper end of said rod and supportingrevolubly the upper one of said nuts, and thereby, said tube and saidhood.

RICHARD A. WALKER.

